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Winter medium range model pbp I


GaWx

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FFC is very interested...

 

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PEACHTREE CITY GA
253 PM EST FRI JAN 16 2015

 

.LONG TERM /SUNDAY THROUGH FRIDAY/...
SHORTWAVE IS EXITING THE AREA SUNDAY INTO SUNDAY NIGHT WITH JUST
SOME LINGERING POPS IN EXTREME NORTH AND NORTHEAST GEORGIA.
NORTHWEST FLOW BEHIND THE SHORTWAVE AND SURFACE HIGH PRESSURE
DEVELOPING EARLY IN THE WORKWEEK WILL PROVIDE FOR FAIRLY BENIGN
WEATHER WITH SLOWLY INCREASING TEMPERATURES. ANOTHER WEAK
SHORTWAVE PUSHES THROUGH TUESDAY NIGHT INTO WEDNESDAY AND HAVE
CONTINUED TREND OF SLIGHT CHANCE POPS...WITH OVERNIGHT
TEMPERATURES TOO WARM FOR ANY P-TYPE CONCERNS.

BEYOND THAT...MODEL SOLUTIONS BEGIN DIVERGING FOR THE NEXT SYSTEM
POTENTIAL THURSDAY NIGHT INTO FRIDAY. 12Z ECMWF CONTINUES THE
TREND OF THE 00Z GFS AND 00Z ECMWF WITH SPREADING MOISTURE FROM
THE GULF ACROSS THE SOUTHEAST THURSDAY NIGHT INTO FRIDAY MORNING
FROM A STRONG SHORTWAVE ACROSS THE PLAINS. 12Z GFS HOWEVER DOES
NOT PHASE THE PLAINS SHORTWAVE WITH THE GREAT LAKES LONGWAVE
TROUGH AND KEEPS THE POLAR AND SUBTROPICAL JETS SEPARATE...
LEAVING GEORGIA IN A DRY SUBSIDENT REGIME. 12Z GFS IS ALSO
TRENDING COLDER BUT BY DOING THIS IS ACTUALLY MORE IN LINE WITH
THE 00Z ECMWF TEMPS...WITH THE 12Z MEX INDICATING 33 FOR ATL /00Z
MEX WAS 38...00Z ECM WAS 34/. SO...ACROSS NORTH GEORGIA...WITH
THESE TEMPS PLUS MOISTURE INDICATED ON THE MORE CONSISTENT
ECMWF...HAVE ADDED A RAIN/SNOW MIX GENERALLY NORTH METRO ATLANTA
TO THE STATE LINE FOR FRIDAY MORNING. CANNOT OVER-EMPHASIZE THE
AMOUNT OF UNCERTAINTY AT THIS TIME /WE ARE TALKING DAY 6 AFTER
ALL/ SO THIS WILL BE ADJUSTED AND REFINED AS WE GET CLOSER.


TDP

 

http://forecast.weather.gov/product.php?site=FFC&issuedby=FFC&product=AFD&format=CI&version=1&glossary=1

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This is what KCAE currently thinks: (I'm currently in 100% agreement with this)

 


THE UPPER PATTERN BECOMES MORE ZONAL MONDAY THROUGH  
THURSDAY...BRINGING A PERIOD OF DRY WEATHER TO THE AREA. AS WE GET  
INTO THE THURSDAY AND FRIDAY THE MODELS SHOW AN UPPER TROUGH  
DEVELOPING AND MOVING EAST FROM THE CENTRAL PORTION OF THE  
COUNTRY. THATS WHERE THE DIFFERENCE START. THE GFS BRINGS THE  
SYSTEM THROUGH DRY ON FRIDAY...WHILE THE 00Z ECMWF MOVES IT  
THROUGH RATHER WET DURING THE OVERNIGHT PERIOD THURSDAY INTO  
FRIDAY. AT THIS POINT IF THE ECMWF IS RIGHT AND THE SYSTEM IS  
WET...TEMPERATURES SHOULD NOT BE AN ISSUE...WITH OVERNIGHT  
READINGS THURSDAY NIGHT IN THE UPPER 30S TO LOWER 40S.
READINGS ON  
FRIDAY ARE FORECAST TO RISE TO AROUND 50.

 

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What I didn't like about today's 12Z runs as regards 1/23 is the overall less cold leading up to it. Hopefully, these runs were a blip and colder trend will resume to get this to be a much more widespread snowstorm like was seen at 0Z. Today's model consensus really backed off of cold in much of the E US for late Jan vs early yesterday! Not what I wanted to see at all. Hopefully, the models will go back to colder soon.

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 As always, everything has to be so perfect to get a widespread SE snowstorm. Otherwise, they wouldn't occur only once every couple of years on average. Although cold enough on the 18Z GFS, there is no moist WSW 500 mb flow above the cold air to bring in the moisture and bring a Miller A ENEward over the N GOM.

 

 If we can only go back to those beautiful runs of yesterday's GFS/Euro. That was a near perfect setup for a SE snowstorm! A cold enough Arctic high to the north extending just enough influence to the SE to make it cold enough (850's 0C or colder) while there is WSW 500 mb flow and a weak Miller A traversing the N GOM.

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"Honestly the biggest thing I wanted to see from the OP and ENS is the time frame start getting closer and closer with this potential threat.  Ie, I won't want to see it always in the D8-10 timeframe...so, IMHO its at least a good sign the time is getting shorter and shorter.  We are about D6-7 for the most part now." 

 

 Chris, that's why I'm happy to see it running down around Fla with suppressed  glee.  I hate seeing it as good as it can get out early.  I want some suppression so I can urge it north, and get warm so I can try to pull the cold down :)  Mind over weather...makes 'em special when you can help make it happen, lol.  I love this pattern the GFS is showing us.  Storms wrapping up in the gulf instead of dragging across, and cold air hovering around to the north.  Get that going in winter, and one will hit, maybe two.  I think any time it rains down here now, there's at least a chance.  Got close yesterday.  Tony

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JMA would be a big hit, nice looking winter storm. First time that I recall the JMA showing anything at all this winter.

 

Pack,

 Nice hit for whom? Also, where is the 0C 850 line? Where does the low track? Is it a Miller A? Does it look like those great runs of yesterday?

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3 of the members have snow down in north FL too.

                                                                      :lmao: 

     :nerdsmiley: 

 

                    :drunk:

 

Any way you can post a map?

 

:mapsnow:

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Pack,

 Nice hit for whom? Also, where is the 0C 850 line? Where does the low track? Is it a Miller A? Does it look like those great runs of yesterday?

 

Miller A....Looks like SLP tracks right over HAT after this.  I don't have surface but 540 line is in southern VA at 180 but temps crash as the SLP tracks over HAT.  Looks like rain to snow would be a guess.

post-2311-0-35368200-1421457189_thumb.pn

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Miller A....Looks like SLP tracks right over HAT after this.  I don't have surface but 540 line is in southern VA at 180 but temps crash as the SLP tracks over HAT.  Looks like rain to snow would be a guess.

 

Thanks. What about the 0C 850 line from AL to SC/NC? Where does it line up?

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